Question

What was Mohorovičić's observation?(1 point)
Responses

Seismic waves could not go through the brittle crust.
Seismic waves could not go through the brittle crust.

Seismic waves penetrated all Earth's layers.
Seismic waves penetrated all Earth's layers.

Seismic waves travelled at varying speeds.
Seismic waves travelled at varying speeds.

Seismic waves travelled at constant speeds.

Answer 1

Mohorovičić's observation was that **seismic waves travelled at varying speeds**. This observation led to the understanding of different layers within the Earth, notably the transition from the crust to the mantle.